linux-kernel - RE: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid

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Date:   Mon, 21 Mar 2022 08:04:49 +0000
From:   "Tian, Kevin" <kevin.tian@...el.com>
To:     Lu Baolu <baolu.lu@...ux.intel.com>,
        Joerg Roedel <joro@...tes.org>,
        "Jason Gunthorpe" <jgg@...dia.com>,
        Christoph Hellwig <hch@...radead.org>,
        "Raj, Ashok" <ashok.raj@...el.com>, Will Deacon <will@...nel.org>,
        Robin Murphy <robin.murphy@....com>,
        Jean-Philippe Brucker <jean-philippe@...aro.com>
CC:     Eric Auger <eric.auger@...hat.com>,
        "Liu, Yi L" <yi.l.liu@...el.com>,
        "Pan, Jacob jun" <jacob.jun.pan@...el.com>,
        "iommu@...ts.linux-foundation.org" <iommu@...ts.linux-foundation.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: RE: [PATCH RFC 06/11] iommu/sva: Use attach/detach_pasid_dev in SVA
 interfaces

> From: Lu Baolu <baolu.lu@...ux.intel.com>
> Sent: Sunday, March 20, 2022 2:40 PM
> +struct iommu_sva *
> +iommu_sva_bind_device(struct device *dev, struct mm_struct *mm, void
> *drvdata)
> +{
> +	int ret = -EINVAL;
> +	struct iommu_sva *handle;
> +	struct iommu_domain *domain;
> +
> +	handle = kzalloc(sizeof(*handle), GFP_KERNEL);
> +	if (!handle)
> +		return ERR_PTR(-ENOMEM);
> +
> +	ret = iommu_sva_alloc_pasid(mm, 1, (1U << dev->iommu->pasid_bits)
> - 1);
> +	if (ret)
> +		goto out;
> +
> +	domain = iommu_sva_domain_alloc(dev);
> +	if (!domain) {
> +		ret = -ENOMEM;
> +		goto out;
> +	}
> +	domain->sva_cookie = mm;

one domain can be attached by multiple devices, so this should not be
a blind alloc.